13. Give two examples for positive work done
14. Say true or false:
(a) Work done by a body against friction results in a loss of potential energy.
(b) The work done by the force of gravity on moon moving round the earth is zero.
15. Define unit of work.
16. Define notochord.
Answers
Answer:
a)Examples of positive work done
Kicking a football.
Moving a chair.
Throwing a stone.
Riding a bicycle.
Doctors moving a patient in wheel chair.
striking a pen into another pen.
Riding a skateboard.
Pushing and moving a table
Explanation:
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Answer:
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Explanation:
13. Kicking a football.
Moving a chair.
14. a. true b. false
15.The SI unit of work is Joule (J) Work = Force x Distance. 1 Joule = 1 newton x 1 metre. Therefore, we define 1 Joule as the amount of work done when a force of one newton moves a body through a distance of 1 metre in the direction of force applied.
16. The notochord is the defining structure of the chordates, and has essential roles in vertebrate development. It serves as a source of midline signals that pattern surrounding tissues and as a major skeletal element of the developing embryo.